Say you’ve got a black and white JPG or GIF that you want to cut out on your glowforge. Have you got Illustrator? This tutorial shows you how to convert that B&W image into a vector “strokes” suitable for cutting.
Note: @tony.sausageking points out that if you check the ‘ignore white’ checkbox in the Image Trace dialog, you can skip all the steps having to do with removing the white. That said, learning the “Select same fill & stroke” command is helpful for getting out of a LOT of Illustrator tangles.